Advisory details:
github_osv / GHSA-5fw2-mwhh-9947
| Advisory ID | github_osv/GHSA-5fw2-mwhh-9947 |
| Aliases |
CVE-2026-41279
|
| Summary | Flowise: Unauthenticated TTS endpoint accepts arbitrary credential IDs — enables API credit abuse via stored credentials ### Summary The text-to-speech generation endpoint (`POST /api/v1/text-to-speech/generate`) is whitelisted (no auth) and accepts a `credentialId` directly in the request body. When called without a `chatflowId`, the endpoint uses the provided `credentialId` to decrypt the stored credential (e.g., OpenAI or ElevenLabs API key) and generate speech. ### Root Cause ```typescript // packages/server/src/controllers/text-to-speech/index.ts:58-64 } else { // Use TTS config from request body provider = bodyProvider credentialId = bodyCredentialId // ← attacker-controlled credential ID voice = bodyVoice model = bodyModel } ``` ### Docker Validation `POST /api/v1/text-to-speech/generate` with arbitrary `credentialId` in body: endpoint processes request, sends SSE `tts_start` event, only fails when credential doesn't exist — proves code path runs without authentication. ### Impact - Use victim's API keys (OpenAI, ElevenLabs, Azure, Google) without authorization - Burn API credits on the victim's account - Generate unlimited speech content at victim's expense - Combined with credential ID leak from Finding 2, this is trivially exploitable ### Suggested Fix Remove the TTS endpoint from `WHITELIST_URLS` or validate that the credential belongs to the chatflow being used: ```typescript // Only allow credentialId when it matches the chatflow's TTS configuration if (!chatflowId) { return res.status(401).json({ message: 'Authentication required' }) } ``` --- ## References - `packages/server/src/controllers/text-to-speech/index.ts` lines 10-162 - `packages/server/src/utils/constants.ts` line 41 (whitelist entry) ## Credits - Shinobi Security - https://github.com/shinobisecurity |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.4 |
| Risk | 3.7 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.5 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-5fw2-mwhh-9947/GHSA-5fw2-mwhh-9947.json |
| cvssv4 | 8.2 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-5fw2-mwhh-9947/GHSA-5fw2-mwhh-9947.json |
| generic_textual | HIGH |
| Reference id | Reference type | URL |
|---|---|---|
| https://github.com/FlowiseAI/Flowise | ||
| https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-5fw2-mwhh-9947 | ||
| CVE-2026-41279 | https://nvd.nist.gov/vuln/detail/CVE-2026-41279 |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-04-23T20:17:43Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/41xxx/CVE-2026-41279.json
Source Advisory: vulnrichment/CVE-2026-41279
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'partial'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]